[Little Bill]

One of the mechanisms that I have seen is poor start up superheat control on UP’s. On older units it was difficult to prevent rather large swings in temperature if the operator didn't have his act together.

I have seen the results of a pressure tap failure and it wasn't pretty.

[dalight]

This unit is controlled by a huge analog computer that about half the size of a basketball court. It is possible to cook the secondary superheater or the high temperature reheater section which will get you popped boiler tubes.

But, when it comes down to it.. start-up is very different from operation in these units. But, I never actually had any training on this just the same so I don’t have a clue about the tricks or the challenges.